ChinaXing

;                          Stumbling towards Y
;
; The applicative-order Y combinator is a function that allows one
; to create a recursive function without using define.
; This may seem strange. Usually a recursive function has to call
; itself, and thus relies on itself having been defined.
;
; Regardless, here we will stumble towards the implementation of the
; Y combinator (in Scheme).

ChinaXing

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;
import java.util.Formatter;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;


/**